709 SOIL STABILIZATION MATTING

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709.01 DESCRIPTION.
For areas that are at final grade, install soil stabilization matting in conjunction with permanent vegetation groundcover per Section 705, 706 and 707, or as specified.
For areas that are not at final grade or that will be redisturbed at least 6 months after seeding operations are completed, install soil stabilization matting in conjunction with Section 704 or 705.
Performance of Soil Stabilization Matting as specified herein complies with all requirements of the Maryland Department of the Environment for permanent seeding.
709.02 MATERIALS.
Topsoil       920.01
Turfgrass Sod       920.04.06
Soil Stabilization Matting (SSM)       920.05.01
Fasteners       920.05.02
Water       920.09.01
709.03 CONSTRUCTION.
709.03.01 Modification Request. Certain types of matting may be substituted for other matting when the substitution will provide improved erosion protection.
Submit a written Modification Request to substitute one type of soil stabilization matting for another type in areas where specific types of matting have been specified.
The EngineerAny person designated by the Administrator or the procurement officer, acting directly or through his duly authorized representative, such representative acting within the scope of the particular duties assigned to him or of the authority given him. in consultation with the Landscape Operations Division will evaluate the Request. If granted, a notice of approved modification will be returned within 14 days after the request is received.
The following modifications and others may be approved.
(a) Turfgrass Establishment: Type D SSM in lieu of Type A SSM.
(b) Turfgrass Establishment: Type A SSM in lieu of Type E SSM.
(c) Meadow Establishment: Type D SSM in lieu of Type E SSM.
(d) Shrub Seeding Establishment: Type D SSM in lieu of Type E SSM.
709.03.02 Soil Preparation. Perform operations when soil moisture and weather conditions are suitable. Cease operations when soil is frozen, saturated, or when conditions are otherwise unsuitable. Perform operations for the SSM type as follows.
(a) Type A. Prepare soil and seedbed for Turfgrass Establishment per Section 705, or for other specified vegetation, but do not apply mulch.
Install SSM as specified in 709.03.03 thru .06.immediately after seeding and fertilizing.
(b) Type B. Prepare soil and seedbed for Turfgrass Establishment per Section 705, or for other specified vegetation, but do not apply mulch.
Firm soil with an approved roller to ensure uniform soil surface and firmness. The roller shall weigh approximately 40 lb per ft of width.
Install SSM as specified in 709.03.03 thru .06 immediately after seeding, fertilizing and rolling are completed.
(c) Type C. Prepare soil and firm with an approved roller to ensure uniform soil surface and firmness.
Install Type C SSM as specified in 709.03.03 thru .06 and infill with soil per 709.03.07.
(1) Immediately perform Turfgrass Sod Establishment per Section 708, but do not till; or
(2) Immediately perform Turfgrass Establishment per Section 705, but do not till or apply mulch, and then cover with Type B SSM; or
(3) Immediately install other specified material and vegetation.
(d) Type D. Prepare soil and seedbed for Meadow Establishment per Section 707, or for other specified vegetation, but do not apply mulch.
Install SSM as specified in 709.03.02 thru .05 immediately after seeding and fertilizing.
(e) Type E. Prepare soil and seedbed for Turfgrass Establishment per Section 705, or for other specified vegetation, but do not apply mulch.
Install SSM as specified in 709.03.03 thru .06 immediately after seeding and fertilizing.
709.03.03 Unrolling. Unroll SSM in the direction of the flow of water. Lay matting smoothly in firm, uniform contact with the soil surface, without stretching or tenting.
709.03.04 Overlapping. Overlap SSM with the upslope portion on top. Overlap edges at least 2 in., and ends at least 6 in. Do not install longitudinal overlaps in channel bottoms.
709.03.05 Keying-in. Key-in matting by digging a trench, fastening and backfilling one or more edges of the matting into the bottom of the trench.
(a) Type of Matting. Key-in the areas described in Table 1 for each type of matting:
SOIL STABILIZATION MATTING

TABLE 1 - AREAS OF MATTING TO KEY-IN

MATTING TYPE AREAAmerican Railway Engineering Association OF MATTING
A, B Uppermost or leading-edge.
A, B, D Edges adjacent to pavement, catch basins, and structures.
B Lowermost or toe-edge.
B Check trenches; folds of matting perpendicular to water flow every 40-45 ft.
C All edges.
C Check trenches; folds of matting perpendicular to water flow every 20-25 ft.
D Edges exposed to flow in BSM, ponds, swales, channels, slopes. All edges when installed in streams.
E As directed.
(b) Trenching. TrenchAn excavation made for the purpose of installing or removing pipes, drains, catch basins, etc., which is later refilled. into the soil perpendicular to the flow of water to at least 6 in. depth.
(c) Fastening. Install fasteners per 709.03.06 through SSM into the bottom of the trench.
(d) Backfilling. Backfill the trench with firmly tamped soil, and secure the matting over the backfilled area.
709.03.06 Fastening. Secure SSM with fasteners driven perpendicular to the soil grade, and flush with the surface of the matting.
(a) Fastener Selection. Refer to 920.05.02 and use fasteners of the shape and length approved for the matting type according to Table 2.
When more than one fastener is acceptable for a type of matting per Table 2, install the fastener type and length best suited to the installation conditions to ensure that the matting is securely installed, or as directed.
(b) Placement of Fasteners. Install fasteners at the specified distance apart as required for the matting type and the area of matting according to Table 3.
SOIL STABILIZATION MATTING

TABLE 2 - FASTENER SELECTION

MATTING TYPE FASTENER SHAPE FASTENER LENGTH*
6 in. Length 8 in. Length 12 in. Length 18 in. Length
A & E U-Shaped Staple X X
Circle-Top Pin X X
Round Head Pin X X
T-Head Pin X X
B U-Shaped Staple X X
Fabric Pin X X
C U-Shaped Staple X X
Fabric Pin X X
D U-Shaped Staple in BSM, Ponds, Swales, SlopesThe inclined graded areas beyond the shoulder, extending from the shoulders to the natural, undisturbed surface of the ground. X X X
U-Shaped Staple or Fabric Pin in Channels, Streams X X X
Note: *X=Denotes fasteners acceptable for the matting type. Refer to 709.03.06(a)
SOIL STABILIZATION MATTING

TABLE 3 - FASTENER PLACEMENT

AREAAmerican Railway Engineering Association OF MATTING MATTING TYPE MAXIMUM DISTANCE BETWEEN FASTENERS In.
Uppermost or Leading-Edge of Matting A, B, C, D, E 6
Overlapping Edges of Matting A, B, C, D, E 18
Center of Ditch A, B, C, D, E 18
Lowermost or Toe-Edge of Matting A, B, C, D, E 18
Throughout Matting A, B, C, D, E 24
Check Trenches in Folds Every 40-45 ft B1 12
Check Trenches in Folds Every 20-25 ft C 12
Note: 1Do not install check trenches in Type B SSM installed over Type C SSM.
709.03.07 Infilling Type C SSM. Infill the matting with approved topsoil to fill matting voids and to cover the matting with topsoil to a depth of 1/8 in. to 1/4 in. Immediately install sod, or seed and cover with Type B SSM, or as specified.
709.03.08 Watering. Gently apply water with a sprinkler or water-breaker nozzle immediately after installation is completed as follows.
(a) For Type E SSM, apply water over the surface of the matting as needed to settle the matting and soil.
(b) For Types A, B, and D SSM, apply water over the surface of the matting to wet the soil at least 2 in. depth.
(c) For Type C SSM, apply water over the sod, over the Type B SSM, or over other specified material, to wet the soil at least 2 in. depth.
709.03.09 Installation Phase Acceptance. Inspection will be conducted to verify that matting and vegetation installation operations were completed as specified. Installation Phase Acceptance will be granted at that time.
709.03.10 Establishment Phase. The Establishment Phase will begin upon Installation Phase Acceptance. Perform the following during the Establishment Phase.
(a) Period of Maintenance. Maintain areas of soil stabilization matting until Final Acceptance.
(b) Required Maintenance. Perform the following during the Establishment Phase.
Watering. Apply water to ensure survival of the seeded species or sod as needed. Apply water with approved machinery. Do not allow water to cause erosion or to displace the matting, seed, or sod.
Reset Matting. When matting is not firmly fastened to the soil, or if keyed-in areas or check trenches are not secure, repair the unsecured areas using fasteners as needed or as directed.
Seeding Repair. When Turfgrass Establishment has not met acceptance standards, remove Type A, B, D, or E SSM and refer to 705.03.09 and perform overseeding or reseeding as directed. Remove Type C matting only if directed. Install new matting unless the original matting is approved for reuse.
When Shrub Seeding Establishment or Meadow Establishment has not met acceptance standards, remove Type D or E SSM and refer to 706.03.10(b) and perform overseeding in conformance with specifications for the pertinent vegetation. Install new matting unless the original matting is approved for reuse.
Sod Replacement. When Turfgrass Sod Establishment does not meet acceptance standards, refer to 708.03.12 and remove the unacceptable sod and install new sod.
709.03.11 Final Acceptance. The EngineerAny person designated by the Administrator or the procurement officer, acting directly or through his duly authorized representative, such representative acting within the scope of the particular duties assigned to him or of the authority given him. and the Landscape Operations Division will complete an Inspection Report of the installed soil stabilization matting and vegetation establishment in conformance with the pertinent specifications. When it is not possible to perform the Inspection, Final Acceptance will be delayed until Inspection is possible.
The Inspection Report will be included in the Punch List requirements for the project. Complete the Punch List requirements as directed. Final Acceptance will be granted when the SSM is secure, and when the specified vegetation has met acceptance standards.
709.04 MEASUREMENT AND PAYMENT.
Soil stabilization matting will be measured and paid for at the Contract unit price per square yard for one or more of the specified items. The payment will be full compensation for all material, fasteners, water, labor, equipment, tools, disposal fees and incidentals necessary to complete the work.
(a) Payment Schedule. Payments will be made according to Table 4 when construction requirements are met.
SOIL STABILIZATION MATTING

TABLE 4- PAYMENT SCHEDULE

CONSTRUCTION REQUIREMENTS PERCENT OF TOTAL CONTRACT PRICE PAYMENT FOR COMPLETED WORK
709.03.01 thru .09 80 At Installation Phase Acceptance
709.03.10 and .11 20 At Final Acceptance
Total Payment 100%
(b) Forfeiture. Failure to complete operations as required in conformance with the Payment Schedule will result in forfeiture of that percentage of payment.
709.04.01 Type A Soil Stabilization Matting. The measurement will be the area actually covered by matting, per square yard. Payment for Turfgrass Establishment or other specified vegetation will be measured and paid for separately.
709.04.02 Type B Soil Stabilization Matting. The measurement will be the area actually covered by matting, per square yard. Payment for Turfgrass Establishment or other specified vegetation will be measured and paid for separately.
709.04.03 Type C Soil Stabilization Matting. The measurement will be the area actually covered by matting, per square yard. Topsoil used for infilling will be incidental to the Contract price. Payment for Type B Soil Stabilization Matting, Turfgrass Sod Establishment, Turfgrass Establishment, or other specified vegetation will be measured and paid for separately.
709.04.04 Type D Soil Stabilization Matting. The measurement will be the area actually covered by matting, per square yard. Payment for Meadow Establishment or other specified vegetation will be measured and paid for separately.
709.04.05 Type E Soil Stabilization Matting. The measurement will be the area actually covered by matting, per square yard. Payment for Turfgrass Establishment or other specified vegetation will be measured and paid for separately.
709.04.06 Temporary Mulch and Temporary Seed will be measured and paid for at the pertinent Contract unit price per square yard. Any soil stabilization matting which may be installed with Temporary Mulch or Temporary Seed will be incidental to the pertinent Contract unit price of those items in conformance with 704.04.01 or 704.04.02.